314 PROCEEDINGS OF THE AMERICAN ACADEMY, 



phlla most closely resembles C. petrophlla, Gray, but from this species it 

 is readily distiuguished by the inflorescence, and by the much larger 

 heads. In the nature of the inflorescence G. rhyacopldla is perhaps 

 more nearly allied to C. anthemoides, DC, but from this species again 

 our plant differs markedly in the coarser character of the leaves, and by 

 the erect ligneous stem. 



Spilanthes fllipes. Herbaceous : stems erect, freely branching from 

 the base, 3 to 4 dm. high, rather sparsely pubescent with jointed hairs ; 

 leaves opposite, petiolate, 3-nerved from near the base, ovate to oblong- 

 lanceolate, including the petiole 2.5 to 6 cm. long, 0.8 to 2 cm. broad, 

 obtusish, submucronate, crenate-dentate, narrowed rather abruptly or 

 even attenuate at the base into a ciliated petiole, glabrous or with a few 

 scattered hairs on the upper surface and on the midrib and lateral nerves 

 beneath: heads radiate, 4 to 5 mm. high, nearly or quite as broad, borne 

 on long slender (5 to 10 cm. long) peduncles which either terminate the 

 stems and branches or spring from the upper axils ; involucral scales 

 oblong-ovate, 2 to 2.5 mm. long, slightly acuminate, acute, inconspicu- 

 ously ciliate ; ligules about 5, including the tubular portion 4 mm. in 

 length; achenes of ray-flowers triangular: flowers of the disk 2.5 mm. 

 long; achenes laterally compressed bearing two minute pappus-awns, 

 ciliated, glabrous or nearly so on each face, at maturity about 1 mm. in 

 length ; pales rounded or subtruncate at the apex. — Collected by Dr. 

 G. F. Gaumer in Yucatan, 1896, no. 1122. In general appearance 

 S.fiUpes most resembles ^S*. r-amosa, Hemsl., but it differs matei-ially by 

 having much larger leaves, smaller heads, and stricter habit. 



Dysodia Seleri, Robinson & Greenman, n. sp. Stoutish herb: 

 branches terete, striate, puberulent, at length glabrate, glandless : leaves 

 simple, opposite or sub-opposite, oblong, shortly acuminate, rounded or 

 more often cordate at the sessile base, sharply and rather finely serrate, 

 6 to 13 cm. long, 2.4 to 4 cm. broad, dotted with numerous round pellu- 

 cid glands; the uppermost leaves reduced, elliptical, often alternate: 

 peduncles terminal, more or less clavate-thickened toward the summit : 

 heads radiate, lar^e, 3 cm. in diameter exclusive of the ligules: involucre 

 puberulent, glandless; outer scales free, about 2-seriate, unequal, lanceo- 

 late, acute, herbaceous at least near the apex ; inner scales united for 

 two-thirds their length, their tips attenuate: rays 12 to 20, brown in a 

 dried state, broadly elliptical, about 2 cm. long including the tapering 

 tubular base ; pales short, thickish, fimbriate : tubular flowers 2 cm. long 

 including the sericeous-villous achenes : pappus 2-seriate, of about 20 

 subequal setose-fimbriate scales, 1 cm. in length : style-branches passing 



